A few things:
1. You can get better than 30% off. If you have a Qantas Business Rewards account, not only do you get the flights at 30% off but you also get 5,000 points credited back.
2. There have been problems with the booking engine. Confirmed by the agent in Cape Town. She advised to keep trying and to do so on different browsers. I tried using Safari which didn't work but Chrome worked perfectly. Safari still not working 2 days later.
3. This is the best redemption value I have seen. Return to Melbourne from Hervey Bay next October (more on that next point) including carrier fees, saved spending $2,602 for 33,600 points. That values the points at 7.75c each.
4. While the website states that the offer ends on 27 October 2022, I successfully booked my return on 28 October 2022. It might have been that on the day of launch that 28 October was 352 days away but the next day, the 28th was available.